Mopar Muscle Association UK

Temp gauge not working on my roadrunner & petrol gauge always reads lower than it really should.

Have continuity checked the voilet temp wire from the clocks to the temp sensor, fine & tired earthing the wire but no movement on the gauge.
circuit board on clocks looks really good with no cracks etc

Now the dumb Questions..................

So am I right in thinking it is probably the voltage regulator ?
Is the voltage reg the 2 parts on this photo with the arrows to it ?
Can I test it ?
Who's the best to get one from ?

Anything else I can do ? or could it be the gauge itself ?

Bin it and build an electronic one from parts out of Maplins for a fiver and get a constant 5 volts to the gauges without any fluctuations.
Plenty of info on it on the Challenger Messageboard, ask yer Daveman for a link I can't do it from this poxy phone

Sounds like it firstly - from experience I had - yes that is the voltage regulator your arrows are pointing to. You probably can test it - One of the Daves or someone with more knowledge than me will point you in the right direction if you can use a mutiimeter. If replacement is required dashworks in the states do an upgraded one for $55 if you can't find one here or want an upgrade .

I bought a solid state one as recommended by Blue but never used it. Think it was around £35 delivered from the states.

Yes they are easy to make. You need to check the voltage from it with a meter first to make sure that is where the problem is. Then i can pop into Maplins one lunchtime for you if you like.

Here is the link so you can make one.
I have all the parts as I'm planning on make 10 or more and selling them to club members so if you need the parts quick let me know.

http://www.allpar.com/history/mopar/electrical2.html

That's a good idea and I don't know why anybody ain't thought to make a batch before. Takes minutes to make and cost next to nothing comared to those custom modified units and they work.
Made one for me Chally in a dinnertime inc install, piece of Bananarama!

cheers lads for all the info, am going to do the conversion highlighted by Mr Norm & Anton, very well explianed on that link, the voltage is fluctuating from 2-4 volts, but think its the temp gauge itself that is u/s

Anybody got a working 68-70 non rallye dash temp gauge ??

did a quick hnd in electronics then this conversion as per the excellent link above, Adrian (top man thanks again) gave me a temp guage out of a van, with a different face but the same mechanism behind, so carfully drilled out the tiny rivets & swapped the facia over, tried it but could not get enough temp in car idling in tonight's northern condition's so shorted temp gauge to earth & flicked ingnition on & bingo temp gauge started to move

Cheers for everyones help & thanks to this club its fixed.

Also I now have joined facebook as per other thread & posted this question & got 'whats a plymouth roadrunner' 'Ive got a saxo just need to pass my test once I get off the dole'

holy thread rivival...........
just so I can find it again
did this to my roadrunner now doing it to my charger

All 3 dash gauges on Charger fried.
Old regulator pushing out 12 volts

3 new gauges + Built an electronic one and fitted into gutted old regulator.

Coming home yesterday hit the same problem- 3 gauges way off to the right. Stopped car quickly and pulled wires to all 3 sender units.
Back home checked the electronic regulator- 12 volts at both terminals
Opened it up. No shorts, just 12 volts at the 5 volt terminal.

Did it burn out and short to the input voltage?
Could a voltage of amperage spike cause it to fail?
Before it failed I blipped the throttle on start up and the amp gauge was 30-40 amps.
Bit stumped and can't afford to risk the gauges again.

Cheers
Eddie

In Andyrob picture I cant see the capacitor to protect the chip against voltage spikes and that could be you problem.
See the original article on how to build one and they use a capacitor to protect the chip. The one I made has been on my car for three years now.

The cap's pointing straight at us Anton, just by the ground track at the left green wire

Demon James wrote:The cap's pointing straight at us Anton, just by the ground track at the left green wire

I had to look 3 times before I saw it, I must need stronger glasses.